MIXED CATALYST COMPOSITIONS, METAL-SMALL-PORE MOLECULAR SIEVE WITH 8-MEMBER RINGS, CATALYST DEVICES, SYSTEMS AND METHODS Russian patent published in 2020 - IPC B01J29/72 B01D53/56 B01D53/94 

FIELD: chemistry.

SUBSTANCE: present invention relates to catalytic materials for selective catalytic reduction, particularly to selective catalytic reduction device and to method of selective reduction of nitrogen oxides (NO_x). Device for selective catalytic reduction includes coating from porous oxide, containing two components, first finely porous with 8-member rings aluminosilicate zeolite subjected to ion exchange with copper, and second finely porous with 8-member rings aluminosilicate zeolite subjected to ion exchange with iron, in which first and second fine-pore aluminosilicate zeolites with 8-member rings have crystalline structure of SNA and in which first and second fine-pore aluminosilicate zeolites with 8-member rings are present in a weight ratio of 1:1 to 10:1 of the first finely porous aluminosilicate zeolite with 8-member rings to the second finely porous aluminosilicate zeolite with 8-member rings, is a catalyst which efficiently catalyses reduction of nitrogen oxides in the presence of a reducing agent, wherein the first aluminosilicate zeolite with 8-member rings subjected to ion exchange with copper additionally includes a barium component. Catalytic devices are applicable in methods and systems of catalysis of nitrogen oxides reduction in presence of reducing agent. Mixture of Ba-Cu-CHA + Fe-CHA demonstrates the lowest breakthrough of ammonia NH₃ at 230 °C.

EFFECT: technical result is improvement of low-temperature performance of existing SC-based catalysts based on Cu-SSZ13.

5 cl, 12 dwg, 1 tbl, 8 ex